# Relationship history for MSHA mine 1505412

Current hierarchy: **Ratliff James Delbert-Danny L & Donald E → Regina Fuel Company → No 1 Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** B R & S Coal Company → No 1 Mine; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Reedy Theril--B Bevins--Bobby & E B Stanley → No 1 Mine; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Reedy Theril--B Bevins--Bobby & E B Stanley → B R & S Coal Company; 1950-01-01 to 1974-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Regina Fuel Company → No 1 Mine; 1974-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff James Delbert-Danny L & Donald E → No 1 Mine; 1974-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff James Delbert-Danny L & Donald E → Regina Fuel Company; 1974-07-01 to current/open; source msha-controller-operator-history